Abstract. The metallic cylindrical storage tanks are very common structures in the field of civil engineering; These facilities are especially used in the industry in which they are used to store all kinds of products-which are for the most toxic or flammable. The tanks are also used in the storing of drinking water. When earthquakes, these structures must be strictly maintained in order to avoid that they lose their precious contents causing reactions that can cause more damage than the earthquake itself. In this study, the effects of the liquid height, the geometric parameters of tanks in the variation of the maximum sloshing wave height are studied: For this purpose, the software ANSYS V11.0 is used for modelling the tanks, the results found are compared with thus given in the Euro code 8

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A new method for computing fracture mechanics parameters applicable for measuring tests relying on Eddy currents is proposed. This method is based on inversing Eddy current with simultaneous use of Artificial Neural Networks (ANN) for the localization and the shape classification of defects. It allows the reconstruction of cracks and damage in the plate profile of an inspected specimen to assess its material properties. The procedure consists on inverting all the Eddy current probe impedance measurements which are recorded according to the position of the probe, the excitation frequency or both. In the non-destructive evaluation by Eddy currents or in the case of an inverse problem which is difficult to solve, results from a lot of variety of concepts such as physics and complex mathematics are needed. The corresponding solution has a significant impact on the characterization of cracks in materials. On the other side, a simulation by a numerical approach based on the finite element method is employed to detect cracks in materials and eventually, study their propagation. It is shown here that this method has emerged as one of the most efficient techniques for prospecting cracks and enables the study of an increase in size of cracks and its propagation in aluminum material. Besides, it can easily predict future defects in different mechanical parts of a given material and be useful in the treatment of materials than the process of changing parts. It has been proven that it gives good results and high performance for different materials.

In this research work, damage propagation at the interface of a cracked sandwich beam is considered. The behavior of Sandwich Beams (SB) depends upon a law based on relationship between tangential or normal efforts with inelastic propagation. As the crack propagates; fracture parameters such as stress intensity factors and energy release rates corresponding to the applied shear stress in mode I and II are determined. Linear and nonlinear models are presented. It is shown that the Timoshenko beam’s theory is employed in the formulation of transverse shear and peel stresses at the overlap ends. These parameters are used to derive energy release rates. Besides, effects of the adhesive thickness and shear modulus on the shear and peel stresses in the adhesive are studied. Obtained results from the analytical solution for the case of a sandwich beam at the interface (adhesive part) agree well with numerical investigations available in the literature. It is also proven that the contribution of the adhesive bond to the energy release rate increases for softer adhesives, shorter cracks and thicker bonds.